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docs(cron): add dst description #5679

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Apr 15, 2021
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33 changes: 33 additions & 0 deletions docs/cron-workflows.md
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Expand Up @@ -61,6 +61,39 @@ Currently only a single instance will be executed as a result of setting `starti

This setting can also be configured in tandem with `concurrencyPolicy` to achieve more fine-tuned control.

### Daylight Saving

Daylight Saving (DST) is taking into account when using timezone. This guarantees argo only schedule workflow once when the clock moves forward or back.

For example, with timezone set at `America/Los_Angeles`, we have daylight saving
- +1 hour (DST start) 2020-03-08 02:00:00

| cron | sequence | workflow execution time |
|------------|----------|-------------------------------|
| 59 1 * * * | 1 | 2020-03-08 01:59:00 -0800 PST |
| | 2 | 2020-03-09 01:59:00 -0700 PDT |
| | 3 | 2020-03-10 01:59:00 -0700 PDT |
| 0 2 * * * | 1 | 2020-03-09 02:00:00 -0700 PDT |
| | 2 | 2020-03-10 02:00:00 -0700 PDT |
| | 3 | 2020-03-11 02:00:00 -0700 PDT |
| 1 2 * * * | 1 | 2020-03-09 02:01:00 -0700 PDT |
| | 2 | 2020-03-10 02:01:00 -0700 PDT |
| | 3 | 2020-03-11 02:01:00 -0700 PDT |

- -1 hour (DST end) 2020-11-01 02:00:00

| cron | sequence | workflow execution time |
|------------|----------|-------------------------------|
| 59 1 * * * | 1 | 2020-11-01 01:59:00 -0700 PDT |
| | 2 | 2020-11-01 01:59:00 -0800 PST |
| | 3 | 2020-11-02 01:59:00 -0800 PST |
| 0 2 * * * | 1 | 2020-11-01 02:00:00 -0800 PST |
| | 2 | 2020-11-02 02:00:00 -0800 PST |
| | 3 | 2020-11-03 02:00:00 -0800 PST |
| 1 2 * * * | 1 | 2020-11-01 02:01:00 -0800 PST |
| | 2 | 2020-11-02 02:01:00 -0800 PST |
| | 3 | 2020-11-03 02:01:00 -0800 PST |

## Managing `CronWorkflow`

### CLI
Expand Down